The bombing took place on Friday during a match in the small stadium in the city of Iskanderiyah, 30 miles (50 kilometers) from the capital, Baghdad. IS claimed the attack, saying it had targeted Shiite militiamen.

The extremist group has lost ground in recent months in Iraq and Syria but has struck back with a series of large attacks targeting civilians. IS claimed this week’s attacks in Brussels, which killed 31 people.